BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 
797 
Division THALLOPHYTA. 
Subdivision ALGAE. 
Class CYANOPHYCE^. 
Order COCCOGONALES. 
Family ChroococcacEzE. 
Chroococcus turgidus Nageli. 
Common, in salt marshes, on wet earth and rocks, 
mixed with Caloihrix, Lyngbya, Microcoleus, 
Vaucheria, etc. 
Woods Hole: Little Harbor, Penzance. Ouisset 
salt marshes. Hadley Harbor. 
Spring, summer, undoubtedly at other seasons. 
Gloeocapsa crepidinum Thuret. 
Abundant, on woodwork and rocks at high-water 
mark. 
Woods Hole. 
At all seasons. 
Polycystis elabens Kiitzing. 
Common, in salt marshes, forming slimy masses 
on decaying algae and on Zostera, frequently 
mixed with Lyngbya, Microcoleus, etc. 
Woods Hole: Penzance. Ouisset. Hadley Har- 
bor. 
Summer. 
Farlow, 1881, p. 28 ( Polycystis elabens Kiitzing), 
Woods Hole. 
Family Cham^siphonacS^. 
Dermocarpa prasina (Reinsch) Bornet & Thuret. 
Common, on Polysiphonia fastigiata. 
Woods Hole, off Juniper Point. 
Spring, early summer. 
On Polysiphonia fastigiata, which in turn grows 
on Ascophyllum nodosum. 
Hyella ccespitosa Bornet & Flahault. 
Abundant wherever old shells are found in quiet 
waters. 
Woods Hole. 
Spring, summer, undoubtedly at all seasons. 
Boring into clam and other shells. 
Pleurocapsa fuliginosa Hauck. 
Common, on harbor walls and rocks near high- 
water mark, forming a dark stain. 
Woods Hole. 
At all seasons. 
Order HORMOGONALES. 
Suborder HOMOCYSTE#. 
Family Oscillatoriace^. 
SUBFAMILY VAGINARIE^E- 
Hydrocoleum glutinosum (Agardh) Gomont. 
Common, on Zostera. 
Woods Hole. 
Summer. 
Farlow, 1881, p. 35, 36 (Lyngbya nigrescens vox. 
major Farlow), Woods Hole; A. A. B. Ex., fas. 
1, no. 47 (Lyngbya nigrescens var. major Far- 
low), Woods Hole (W. G. Farlow). 
Hydrocoleum lyngbyaceum Kiitzing. 
Occasional, on Ascophyllum nodosum. 
Harbor of Woods Hole. 
Summer. 
P. B.-A., fas. v, no. 204 (Hydrocoleum lyngbyace- 
um vox. A, Gomont), Woods Hole, August 14, 
1894 (W. A. Setchell). 
Microcoleus chthonoplastes (Flora Danica) Thuret. 
Common, in salt marshes and brackish pools, 
mixed with Lyngbya and other algae. 
Woods Hole: Eel Pond, Penzance. Quisset. 
Hadley Harbor. 
Summer, undoubtedly at other seasons. 
Farlow, 1881, p. 33, 34 (Microcoleus chthono- 
plastes Thuret), Woods Hole; Farlow, 1881, p. 
33 (Oscillaria subtorulosa Brebisson), Woods 
Hole; A. A. B. Ex., fas. v, no. 227, Woods Hole, 
August, 1877 (W. G. Farlow); P. B.-A., fas. 
iv, no. 153, Woods Hole, July 17, 1895 (W. J. V. 
Osterhout) . 
Microcoleus tenerrimus Crouan. 
Occasional, in salt marshes and brackish pools, 
mixed with Microcoleus chthonoplastes, Lyng- 
bya, and other algae. 
Woods Hole: Penzance, Eel Pond. 
Summer. 
Found by F. S. Collins, summer of 1904. 
